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If 0 lt phi lt pi//2 , and x = sum(n = 0...

If 0 `lt phi lt pi//2 , and x = sum_(n = 0)^(infty) cos^(2n) phi, y = sum_(n=0)^(infty) sin^(2n ) phi and z = sum_(n=0)^(infty) cos^(2n) phi sin^(2n) phi, `then

A

xy + z

B

xz + y

C

x + y + z

D

yz + x

Text Solution

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The correct Answer is:
A, C
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